Former Rep. Gabby Giffords speaks with Vice President Joe Biden, at the end of a news conference held by President Barack Obama in the Rose Garden of the White House, in Washington, on Wednesday, April 17, 2013, about the defeat in the Senate of a bill to expand background checks on guns. (AP Photo/Manuel Balce Ceneta)

Associated Press
Former Rep. Gabby Giffords speaks with Vice President Joe Biden, at the end of a news conference held by President Barack Obama in the Rose Garden of the White House, in Washington, on Wednesday, April 17, 2013, about the defeat in the Senate of a bill to expand background checks on guns. (AP Photo/Manuel Balce Ceneta)
Former Rep. Gabby Giffords speaks with Vice President Joe Biden, at the end of a news conference held by President Barack Obama in the Rose Garden of the White House, in Washington, on Wednesday, April 17, 2013, about the defeat in the Senate of a bill to expand background checks on guns. (AP Photo/Manuel Balce Ceneta)
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